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xfs: Check for extent overflow when swapping extents

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Removing an initial range of source/donor file's extent and adding a new
extent (from donor/source file) in its place will cause extent count to
increase by 1.

Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: Allison Henderson <allison.henderson@oracle.com>
Signed-off-by: Chandan Babu R <chandanrlinux@gmail.com>
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
This commit is contained in:
Chandan Babu R 2021-01-22 16:48:15 -08:00 committed by Darrick J. Wong
parent ee898d78c3
commit bcc561f21f
2 changed files with 23 additions and 0 deletions
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7
fs/xfs/libxfs/xfs_inode_fork.h
View File

@ -88,6 +88,13 @@ struct xfs_ifork {
*/
#define XFS_IEXT_REFLINK_END_COW_CNT (2)
/*
* Removing an initial range of source/donor file's extent and adding a new
* extent (from donor/source file) in its place will cause extent count to
* increase by 1.
*/
#define XFS_IEXT_SWAP_RMAP_CNT (1)
/*
* Fork handling.
*/

16
fs/xfs/xfs_bmap_util.c
View File

@ -1399,6 +1399,22 @@ xfs_swap_extent_rmap(
irec.br_blockcount);
trace_xfs_swap_extent_rmap_remap_piece(tip, &uirec);
if (xfs_bmap_is_real_extent(&uirec)) {
error = xfs_iext_count_may_overflow(ip,
XFS_DATA_FORK,
XFS_IEXT_SWAP_RMAP_CNT);
if (error)
goto out;
}
if (xfs_bmap_is_real_extent(&irec)) {
error = xfs_iext_count_may_overflow(tip,
XFS_DATA_FORK,
XFS_IEXT_SWAP_RMAP_CNT);
if (error)
goto out;
}
/* Remove the mapping from the donor file. */
xfs_bmap_unmap_extent(tp, tip, &uirec);